Idaho Written Driver's License Practice Test

Why might the road surface of a bridge be more hazardous in winter than regular pavement?

1. Bridges are constructed with different materials

2. They tend to have potholes more frequently

3. There may be ice or frost present even when other pavement is dry

4. Bridges do not receive snow removal

The correct answer is: There may be ice or frost present even when other pavement is dry

The reason the road surface of a bridge can be more hazardous in winter, particularly due to the presence of ice or frost, arises from the unique exposure of bridges to cold air. Unlike regular pavement, which is surrounded by earth on both sides, bridges are exposed to colder temperatures from above and below. This exposure allows the surface of bridges to cool more quickly, making them more susceptible to icing. Even when other sections of the road may appear dry, the bridge can harbor ice or frost, creating an unexpected and possibly dangerous situation for drivers. This phenomenon often leads to hazardous driving conditions, so it's crucial for drivers to be particularly cautious when crossing bridges during the winter months. The other options do not accurately reflect the dynamics of bridge construction and maintenance in relation to winter conditions. Bridges are typically constructed with similar materials to regular roads, are maintained for pothole repairs, and typically receive snow removal just like other roadways.